What is the space like? Is it small and enclosed? Regardless, you are going to need to provide good ventilation to get rid of the heat. Read up on fans in these forums. See my signature for a good place to start.

Your temperature should be taken from a shaded spot at or near plant level. Direct light on the thermometer will distort the reading.

Put the timer at 18/6 and leave it there until you are ready to flower. Then 12/12.

Keep it simple and don't futz with the plants too much.

Read was much as you can. The stickies around here are pretty good.

I've read about getting more fems from seeds and have a few friends who swear by it. I get feminized seeds myself. Takes the guess work out of it for just a bit more dosh.